HP 48G Series Quick Start Manual page 43

Lesson 11: Arithmetic including Units
You needn't calculate with numbers separated from their natural
measurement units if you use the HP 48. A unit object is a real
number connected to a L measurement unit with an underscore
allows you to 'attach units to numbersand then do arithmetic with the
resulting unit objects. As long as you attach the correct units, it will
keep track of the units as you calculate and report the answer in any
appropriate measurement you want.
Example: Create the unit object ZZ kgm2s,
Step 1: Enter the Units Catalog, key in the value and append the
first unit.
(CLEAR) @B(UNITS) 1: 32_ka
32
oz
ED
KS 3 LE 02 [SLUG] LET
Step 2: Append the second unit. This requires that you return to
the main Units Catalog screen and select a different category.
Note that appending a unit to an object with a unit already
attached implies a multiplication of the units.
l: 32 _ka¥m™e
EE EEE IEE NE EE ITE
Step 3: Append the remaining units in the denominator. Note
that pressing the right-shift (((»)) before the desired unit
implies a diviston—that you want to append the unit in the
denominator instead of the numerator of the compound unit.
1: I_kaEm Esse
EEE ENEELETIEEETE
Arithmetic 3-13